Automatic spark-advancing device



Sept; 25,1923. 1,468,801

N. H. CLARK AUTOMATIC SPARK ADVANCING DEVICE Filed June *7. 1922 Fig. 6

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. 1,468,801, P NT crue -1; 4

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4 snrom'ncsrsax-anvancrndnnvxon Application filedJun e 7, 1922. Serial No. 566,636.

T 0 all whom it may concern:

Be it known that I, NEWELL H. CLARK, a citizen of the United States,i'esiding at New Richmond, in the county of Clermont and State of Ohio, luive invented certain new and useful Improvements in Automatic Spark-Advancing Devices, of which the following is a specification. It is the principalobject to provide simple and effective means to. be

applied to a commutator of an automobile of a common type, for automatically ad vancin the s ark when the engine attains a certain s cc thereby insuring a hot spark at the rig t time independently of manual control of the s, ark adjustingmechanism By'my improve means the spark is automatically produced just before the time of greatest pressure in the cylinder, so that by the time the downward stroke of the piston is started, the highest efficiency of power will have been reached.

Other important and incidental objects will be brought out in the following speci-- fication, and particularly set forth in the subjoined' claims. p

In the accompanying drawings, Figure 1 is a top plan view of a commutator with my improved spark-advancing device applied thereto. Figure 2 is a bottom plan view of the roller mechanism and centrifugal spark-advancing weight. Fi ire 3 is a side view of said mechanism, looking toward the roller. Figure 4 is a side view of said mechanism, looking toward the spring. 1 Figure 5 is a plan view of said mechanism with 8 and cotter pin 9 to the frontlug portion 5 of the collar 4, is a bowed roller arm 10. The latter has a front forked end 11 which receives a shaft 12 on which there is loosely mounted a contact roller 13. Connected between the rear end of the roller arm 10 and of my invention mutator housing.

the lug portion 6 of the collar 4, is a spring '14. (See Figures 1, 2 and 5.)

Fast on the timer shaft 3.is the apertured end of an arm 15. To the outer end of the latter there is pivotally secured, by means of a pin 16, one end of a leaf spring 17 on the outer surface of the middle portion of which there is secured a segmental weight 18. The other end of the leaf spring 17 is pivot-ally secured to the front lug portion 5 of the loose collar 4', by means ofapin 19.

In operation, when the engine is running, the timer shaft 3 will be rotated by it to turn the arm 15 by which the collar 4 is rotated through the instrumentality of the spring 17. To the lug. portion 5 ofthis collar 4 is pivoted theroller arm 10 that has secured to its outer end the contact roller 13 that engages the contact pieces 2 in the com- VVhenthe speed of the engine increases, the centrifugal weight 18 will fly outwardly to cause the spring 17, to which it is secured, to pull the collar 4 forwardly around the shaft The collar 4 thus creeping forwardly, will advance the contact roller 13 to cause it to engage the segmental contact pieces 2 earlier, thereby advancing the spark. Then, when the speed of the engine is lessened, the spring 17 will be free to force the collar 4 inthe opposite direction around the timer shaft 3 to cause the contact roller 13'to engage the contact pieces 2-later,

therebyretarding the spark. It is thus seen that the effect-of my improved means is to automatically advance the spark when the speed o'f the engine increases, and to retard it when the speed of the engine lags.

Havingdescriljied my invention, I claim: 1. In a device'of the type described, the combination with an annular housing, of contact segments set in the inner wall of said 'housing,a timer shaft projecting into saidhousing, a collar loosely mounted on said shaft, a roller arm pivotally secured to said collar, a contact roller on said arm adapted tosuccessively engage the contact segments, an arm fixedly secured to said shaft, a spring connected between the last named arm and the collar, and a weight secured to said spring for the purpose, speci- 2. In a device of the type described, the

combination with an annular housing, of

contact segments set in the inner wall of said housing, a tu shaft projecting into said housing, a collar loosely mounted on said shaft :1 rol' arm pivot-ally secured to said collar a coi-ita t roller 011 said arm adapted to successively engage the Contact segments, an arm fixedly secured to said shaft, a projection on said collar, 1 flat spring connected between the last named arm and the said projection, and a segmental weight secured tothe middle portion of said spring for the purpose specified.

In testimony whereof I have hereunto set my hand this 6th (la of May, 1922.

NEXVELL H. CLARK.

Fitness:

HOWARD SMITH. 

